Financial Disclosure: Dr Larsen has served on scientific advisory boards for H. Lundbeck A/S and GlaxoSmithKline. Dr Aarsland has received research support and honoraria for presentations or serving on scientific advisory boards from H. Lundbeck A/S, Novartis Pharmaceuticals, and GE Healthcare. Dr Goetz has received honoraria for consulting and advisory board membership from Allergan, Biogen, Boehringer-Ingelheim, Ceregene, EMD Pharmaceuticals, Embryon, EMD/Merck KGaA, Impax Pharmaceuticals, I3 Research, Juvantia Pharmaceuticals, Kiowa Pharmaceuticals, Merck, Neurim Pharmaceuticals, Novartis Pharmaceuticals, Osmotica Pharmaceuticals, Ovation Pharmaceuticals, Oxford Biomedica, Schering-Plough, Solstice Neurosciences, Solvay Pharmaceuticals, Synergy/Intec, and Teva Pharmaceuticals; he has received research grants from the National Institutes of Health, Michael J. Fox Foundation, and Kinetics Foundation and directs the Rush Parkinson's Disease Research Center, which receives support from the Parkinson's Disease Foundation; he has received honoraria from the Movement Disorder Society, Northwestern University, American Academy of Neurology, and Robert Wood Johnson Medical School; and he has received royalties from Oxford University Press, Elsevier Publishers, and salary from Rush University Medical Center. Dr Stebbins has received honoraria from the Movement Disorder Society and the American Academy of Neurology; he has received research grants from the National Institutes of Health, Michael J. Fox Foundation, Kinetics Foundation, Fragile X Foundation, and the American Cancer Society; and he receives salary from Rush University Medical Center. Dr Alves has received research support from GlaxoSmithKline and the Norwegian Parkinson's Disease Association, and honoraria for presentations from H. Lundbeck A/S and Orion Pharma.